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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2d4d0cf5f5c111f6246805d5a084ebb9b2672de80723fb48444e487c200037f' 
  AND token = '3zrg5ZiWohrGNoVZohw8SGrwcYG84afg675Eu/n/tSc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}